Boring machine



March 18, 1958 A, H, KLElNsORGE 2,826,945

BORING MACHINE Filed Sept. 2, 1955 2 Sheets-Sheet l FIG/lf .v

March 18, 1958 A. H. KLElNsoRGl-z 2,826,945

i BORING MACHINE Filed Sept. 2, 1955 2 Sheets-Sheet 2 United StatesPatent C 2,326,945v BORING MACHINE Adolph H. Kleinsorge, Amon, Mo.,'assgnor to W. B. Knight MachinerygCompany; St. Louis, Mo., acorporation of Missouri Applicafionsepfember z, '19ss,'sfi1Nu.- '532,2296 claims." (cl. 77.-4)

This invention relates to boring machines, and more particularly tohigh-precision machines of this class.

Among' the several objects of the invention may be noted the provisionof a boring machine with means whereby the spindle of the machine may bereadilyl precisely adjusted as to its angle `in respect to the base ofthe machine, and whereby the accuracy of adjustment may be maintained;the provision of a vertical boring machine, and more'particularly a jigborer, having a base and a spindle-carrying column which extends upwardfrom the base at the rear of the base, with means for readilypreoutwardly anged as indicated at'23and ts between-the flanges 19 withyminimum'clear'ance. The column is supported :on three (and'only three)leveling screwsV 25, 27 and 29 which arev individually verticallymovable for universal adjustment of the angular relationship of thecolumn with respect to thebase, as will be made clear.

Screws 25 and 27 (see Fig. 4) are threaded in vertical tapped holes inthe lower `flanged portion 23 of the column at opposite sides of 'thecolumn and toward the front. Their upper ends areaccessible' forturning, and they have convex lower ends engaging in concave seats ofpads 31. The latter have atlower surfaces engaging the upper surface 17of portion 7 of base 1. Screws 25 and 27 are located on aline at rightangles to't-he'flanges 19 (see Fig. l). The screw 29 v(see Fig. 6) isthreaded in a vertical tapped hole in the upper part of the baseextending upward towardthe' bottomof the column and located tociselyadjustingthe column in both front-to-rear and transprecisiony centeringof the spindle of the machine in the head of the machine, and forelimination of play of the spindle in the head. Other objects andfeatures will be in part apparent andfin ypart pointed out hereinafter.

rlhe invention accordingly comprises the constructions hereinafterdescribed, the scope of the invention being indicated in the followingclaims. p

In the accompanying drawings, in which one of variousl possibleembodiments of the invention is illustrated,

Fig. 1 is a'plan view of a jig boring machine constructed in accordancewith this invention;

Fig. 2 is a side elevation of the machine;

Fig. 3 is a front elevation of the machine;

Fig. 4 is an enlarged cross section taken on line 4-4 of Figs. 1 and 2;

Figs. 5 and 6 are enlarged vertical cross sections taken on lines 5-5and 6 6, respectively, of Fig. 1;

Fig. 7 is an enlarged vertical cross section'taken on line 7 7 of Fig.3, with parts broken away;

Fig. 8 is a bottom plan ofFig. 7, partly in section on line 8-8 of Fig.V7; and,

Fig. 9 isa perspective of an element shown in Figs. 7 and 8. l

Corresponding reference characters indicate corresponding partsthroughout the several views of the drawings.

Referring tothe drawings, a jig boring machine of this invention isshown to comprise a base 1 having a front portion 3 on which is mounteda work-supporting table 5, and havinga raised rear portion 7. The table5, as will be understood in the art, is movable iny front-toreardirection and in transverse direction. Hand wheels for movingr the tableare indicated at `9 and 11. A'rapid traverse and table feed motor isindicated at 13, and a table feed gear box at 15 (see Fig. 2).

The raised rear portion 7 of the base 1 has a generally horizontal uppersurface 17 anked by upwardlyextending vertical flanges 19. These flanges19 extend parallel to one another in front-to-rear direction. Aspindlecarrying column 21 extends upward from the raised rear portion 7of the base 1. The lower end of the column is ward the rear on a lineextending through the screw 25 parallel to the flanges (see Fig. 1). Thelower end of screw 29 is accessible for turning and it has a convexupper end engaging in the concave seat of a pad 31 having a flat uppersurface engaging the bottom of the column. It will be seen from Fig. 1that the threeleveling screws are located at the apices of a righttriangle one leg of which is parallel to the flanges 19 and other leg ofwhich is at right angles to the anges. The screws 25 and 29 are locatedadjacent one of the flanges 19 and the third screw 27 is located acrosskthe column from the forward screw Each of the llanges 19 has .a seriesof` horizontal holes 33 therein (see Fig. 5). Screws 35 extend looselythrough these holes and are threaded in tapped holes 37 in the sides ofthe lower end portion 23 of the column. The holes 33 are enlarged attheir outer ends to provide sockets 39 loosely receiving the heads 41 ofthe screws. By tightening the screws against the inner ends of thesockets 39, the column may be clamped to the flanges, without disturbingthe angular relationship of the column with respect to the base.

The column 21 has a spindle drive gear box 4d at its upper end whichoverhangs the front portion 3 of the base (see Figs. 2 and 3,). Thespindle of the boring machine is indicated at 43. The column contains aspindle driving and feed motor 45. Thespindle 43 extends downward fromthe gear box and has a tool holder 47 fastened to its lower end (seeFig. 7). The lower end of the spindle 43 and the tool holder 47 arerotary Vin a quill 49. Upper and lower precision bearings for the toolholder in the quill are indicated at 51 and 53. The quill is verticallyslidable in a passage 55 in the` forward end of the head 57 of themachine. The head itself is vertically slidable on a track 59 on thecolumn. It will be understood in the art that the head containsadjusting mechanism for sliding it up and downon the'traclr, thismechanism being operated by a hand wheel 61. It will also be understoodin the art that the quill (and the spindle) are vertically slidable inthe head by suitable mechanism including a rack 63 on the quill, apinion (not shown) in the head, and a hand wheel 65 connected to drivethe pinion.

For accuratelycentering the quill in the head, and for eliminating playof the quill in the head, the head is provided with guide means 67 and69 for the quill 49 at the upper and lower ends of the passage S5 in thehead. lEach v guide means comprises an annular holder 71 which isfastened to the head 57 at the respective end of the passage 55 as bymeans of screws 73. The holder has an l axial passage 75 of conicalformation convergent in outward direction with respect to the'head. Theholder. surrounds a contractile metal bushing 77 having a cylindricalaxial passage 79 for the quill. The bushing has 2,826,945 Y l 's y 3 aconicalexterior 81 in wedging engagement with the conical passage 75 inthe holder 71. The bushing is provided with axially extending grooves 83in its outer periphery for; `the purpose of increasing its resilience,but is not split. The bushing, at its smaller end, has a cylindricalportion 85 which is exteriorly threaded for reception of a nut 87. `Thenut 87 seats in a recess 89 f in the outer end of the holder lThenut-has kerfs 91 adapting it for turning by a spanner wrench to move thebushing axially outward with respect to the holder 71 thereby to effectcontraction of the bushing. lt will be observed that the axial movementof the `bushing within the holder results in the application of radialcompressive forces to the bushing which are distributed substantiallyuniformly around the bushing for substantially uniform contraction ofthe bushing.v The result is that the cylindrical form of the passage `79in the bushing is maintained as the bushing is contracted.

It will be understood that in a jig boring machine, it

lis essential for precision work that the axisof the spindle beperpendicular to the plane of the table. The provision of the levelingscrews supporting the column 21 makes it possible readily toadjust thecolumn and spindle in order to attain the necessary degree of precision.By loosening the screws 35, and by turning appropriate ones of theleveling screws 25, 27 and 29, the column may be made to tilt in afront-to-rear vertical plane parallel to the flanges 19, and in atransverse plane at right angles to the flanges, thereby enablinguniversal tilting movement of the column for positioning the spindleaxis 'perpendicular to the plane of the table. While there is only aslight clearance between the lower end of the column and the ilanges,the range of movement in adjusting the column is so small that thereisno binding within the flanges. After adjustment of the column hasbeencompleted, the clamping screws 35 are tightened' to lock the columnin position. Since the clamping of the column is sidewise, there is nodisturbance of the adjustment of the column attained by the levelingscrews.

The guide means 67 and 69 are adjusted by turning the nuts 87 4forprecision centering of the quill and sliding of the quill without play.This is important, since if there is any play of the quill in itspassage in the head, the holes `that are bored Will be elliptical,rather than cir-- cular, and inaccurate centering ofholes may result.The guide means are also adjustable for taking up wear.

While the invention is above described as it pertains to a jig boringmachine,it will be understood that the principles of the invention areapplicable to vertical boring machines in general,\and also to ahorizontal boring machine of the type having a column extending upwardfrom thebase. In the latter case, the adjustment of the column would 4bemadeto make the spindle parallel to the base.

In view f the above, it will be seen that the several objects of theinvention are achieved and other advantageous results attained.` n v Asvarious changes could be made in the 'above constructions withoutdeparting from the scope of the invention, it is intended that allmatter contained in the above description or shown in the accompanyingdrawings shall be interpreted as illustrative and not in a limitingsense.

I claim: i

1. A boring machine comprising a base'includin'g a portion having agenerally horizontal` top surface and upwardly extending parallelangesat the sides of said base portion,.a spindle-carrying column extendingup from said base portion with its lower endbetweensaid anges, saidlower end of the column fitting between said anges with only slightclearance, said column being supported on said base portion by means ofthree and only Vthree vertically adjustable leveling screws, two of saidscrews being located adjacent one of saidanges and the third adjacentthe other flange at the apices of a right triangle one leg of which isparallel to said anges and the other leg of which is at right angles tothe flanges, said screws being individually vertically adjustable foruniversal adjustment of the column relative to the base, and clampingscrews extending horizontally through the flanges for clamping thecolumn to the flanges after adjustment of the column by the levelingscrews without disturbing the adjustment.

2. A boring machine as set forth in claim l wherein said clamping screwsextend loosely through holes in the flanges and are threaded in thecolumn and have heads on their outer ends for engaging the flanges.

3. A boring machine comprising a base having a front portion on which ismounted a work-supporting table and a rear portion having a generallyhorizontal top surface, said rear portion having upwardly extendinganges at the sides, said flanges extending parallel to one another infront-to-rear direction, a spindle-carrying column extending up fromsaid rear portion of the base with its lower end between said flanges,said column having an upper portion extending forward above the tableand a spindle extending down from said upper portion, said lower end ofthe column fitting between said anges with only slight clearance, saidcolumn being supported -on saidrear portion of the base by means ofthree and only three vertically adjustable leveling screws, two of saidscrews being located adjacent one of said flanges and the third adjacentthe other flange at the apices of a right triangle one leg ofiwhich isparallel to said tlanges and the other leg Iof which is at right anglestothe ilanges, ysaid screws being individually vertically adjustable foruniversal adjustment of the column relative to the base, and clampingscrews` extending horizontally through Vtheflanges for clamping thecolumn to the tlanges after adjustment of the column by the levelingscrews without disturbing the adjustment.

4. A boring machine as set forth in claim 3 `wherein said clampingscrews extend loosely through holes in the flanges and are threaded inthe column and have heads on their outerends for engaging the anges.

5. A boring machine as set forth in claim 4 wherein the column has anoutwardly flanged lower end portion, the forward screw of said twoscrews being threaded in said flanged lower` end `portion of the columnand the rearward screw of said two screws being threaded in the rearportion of the base, the third screw being threaded in said flangedlower end portion of the column'across the column from said forwardscrew.

6. A boring machine as set forth in' claim 3 wherein there is a headon'the column, the spindle extending through a passage in the head, andwherein means is provided for centering the spindle and maintaining itcentered in the passage in the head, said means compris Ving acontractile bushing carried by the head having axial- 1y extendinggrooves in its outer periphery, and means for applying compressive forceto the bushing distributed substantially uniformly around the bushingfor substantially uniform contraction of the bushing.

References Cited in the tile of this patent UNITED STATES PATENTS142,416 Sheridan Sept. 2, 1873 643,260 j Tynan Feb. 13, 1900 1,248,794`Becker Dec. 4, 1917 1,298,448 Brassill Mar. 25, 1919 1,483,393 Steberc; Feb. 12, 1924 1,565,980 Hughson et al Dec. l5, 1925 FOREIGN PATENTS1,027,211 France Feb. l1, 1953

